使用监听器实现Java Web的定时任务

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定时器UpdateDataListener类

import java.util.TimerTask;import java.util.concurrent.Executors;import java.util.concurrent.ScheduledExecutorService;import java.util.concurrent.TimeUnit;import javax.servlet.ServletContextEvent;import javax.servlet.ServletContextListener;public class UpdateDataListener implements ServletContextListener{ private ScheduledExecutorService service = null;public void contextInitialized(ServletContextEvent arg0)try {service = Executors.newScheduledThreadPool(1);service.scheduleAtFixedRate(new TimerTask() {@Overridepublic void run() {//AutoUploadFileToFtpDays.getInstance().uploadFile();定时更新任务}}, 12, 120, TimeUnit.SECONDS);//12秒后执行，每隔120秒执行一次，以秒为单位。} catch (Exception e) {e.printStackTrace();}}public void contextDestroyed(ServletContextEvent arg0){if(service != null) {service.shutdown();}}}

最后在web.xml中设置监听器

<listener>    <listener-class>cn.data.listener.UpdateDataListener</listener-class>   </listener>

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